Claims against the estate may be filed in the office of the Clerk of the Circuit Court, Champaign County Courthouse, Urbana, Illinois, or with the Executor, within six months from the date of the first publication of this Notice or within three months after the date of mailing or delivery of Notice to a known creditor, whichever is later, and any claim not filed within that period is barred. Copies of a claim filed with the clerk must be mailed or delivered to the Executor and to the attorney within 10 days after it has been filed.